package com.hy.reggie.controller;

import com.hy.reggie.current.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
//        file是一个临时文件
        log.info(file.toString());

        //随机生成文件名
        String uuid = UUID.randomUUID().toString();

        //获取文件类型
        String contentType = "."+file.getContentType().split("/")[1];

        //最终保存的文件名
        String fileName = basePath + uuid + contentType;

        //创建一个目录对象
        File file1 = new File(basePath);
        //判断目录是否存在
        if (!file1.exists()) {
            //不存在则创建
            file1.mkdirs();
        }

        log.info("文件名:{}",fileName);

        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(uuid+contentType);
    }

    /**
     * 文件下载
     *
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        log.info("文件下载，{}",name);

        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));

            //输出流，通过输出流写回浏览器
            ServletOutputStream servletOutputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                servletOutputStream.write(bytes, 0, len);
                servletOutputStream.flush();
            }

            //释放资源
            servletOutputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }


    }

}
